主题：关于求各种平均值的问题

比如

Dim dt As DataTable = DataTables("零售业务")
Dim d As Date = "2015-10-31"
d = new Date(d.Year, d.Month, 1)
Dim by As Double = dt.Compute("sum(销量)", "部门名称 = '上海南桥大润发' and 所属日期 >= #" & d & "# and 所属日期 < #" & d.AddMonths(1) & "#")
Dim lj As Double = dt.Compute("sum(销量)", "部门名称 = '上海南桥大润发' and 所属日期 < #" & d.AddMonths(1) & "#")
msgbox(by & " " & lj)

这里的Dim d As Date = "2015-10-31",日期只能逐个来写吗